C#•2y ago

❔ ✅ Generic-ify adding scoped for entities

So I've created a repository pattern based logic of dealing with DB entities. Basically I can do IRepository<WhateverClassIWant>() to connect the corresponding entity in the database, issue with this is that on startup, I need to add scopped to all my class:

services.AddScoped<IRepository<Product>, Repository<Product>>();
services.AddScoped<IRepository<User>, Repository<User>>();
services.AddScoped<IRepository<Order>, Repository<Order>>();

services.AddScoped<IRepository<Product>, Repository<Product>>();
services.AddScoped<IRepository<User>, Repository<User>>();
services.AddScoped<IRepository<Order>, Repository<Order>>();

All the above models inherit from a base class called BaseEntity that has some core fields such as Id, CreatedOn, UpdatedOn, etc I want to make this services.AddScoped action generic so I don't need to define this every time I create a new database entity. This is my current status which is not working:

 foreach (BaseEntity BaseType in Assembly.GetAssembly(typeof(BaseEntity)).GetTypes().Where(myType => myType.IsClass && !myType.IsAbstract && myType.IsSubclassOf(typeof(BaseEntity))))
{
    services.AddScoped <IRepository<(BaseEntity)BaseType>, Repository <(BaseEntity)BaseType>> ();
}

 foreach (BaseEntity BaseType in Assembly.GetAssembly(typeof(BaseEntity)).GetTypes().Where(myType => myType.IsClass && !myType.IsAbstract && myType.IsSubclassOf(typeof(BaseEntity))))
{
    services.AddScoped <IRepository<(BaseEntity)BaseType>, Repository <(BaseEntity)BaseType>> ();
}

Directly feeding BaseType is not working either, since IRepository requires a type of T : BaseEntity, not a type of type type

7 Replies

RDasher•2y ago

Also have tried this:

foreach (BaseEntity BaseType in Assembly.GetAssembly(typeof(BaseEntity)).GetTypes().Where(myType => myType.IsClass && !myType.IsAbstract && myType.IsSubclassOf(typeof(BaseEntity))))
{
    services.AddScoped < IRepository < (BaseEntity)BaseType >, Repository < (BaseEntity)BaseType >> ();
}

foreach (BaseEntity BaseType in Assembly.GetAssembly(typeof(BaseEntity)).GetTypes().Where(myType => myType.IsClass && !myType.IsAbstract && myType.IsSubclassOf(typeof(BaseEntity))))
{
    services.AddScoped < IRepository < (BaseEntity)BaseType >, Repository < (BaseEntity)BaseType >> ();
}

Angius•2y ago

You can't cast types like (BaseEntity)BaseType You'll need to invoke the AddScoped() method with reflections as well (or better yet, ditch the repository pattern)

RDasher•2y ago

Yes, I have realized that now, but was worth a shot, as I've gotten so frustrated with this at this point 😆 I'm actually somewhat convinced this isn't a repository pattern anymore, just has the name stuck on it It's very different from a traditional repository pattern googling, will be back

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

RDasher•2y ago

Alright, so the solution to this was much simpler than I thought @Angius Basically, it's just

services.AddScoped(typeof(IRepository<>), typeof(Repository<>));

services.AddScoped(typeof(IRepository<>), typeof(Repository<>));

This is it That works Thanks for the help

RDasher•2y ago

I came across this on the NopCommerce repo https://github.com/nopSolutions/nopCommerce/blob/72657ad4d09f2c1a413dac5c4e780473ac5990ca/src/Presentation/Nop.Web.Framework/Infrastructure/NopStartup.cs Line 239

GitHub

nopCommerce/NopStartup.cs at 72657ad4d09f2c1a413dac5c4e780473ac5990...

ASP.NET Core eCommerce software. nopCommerce is a free and open-source shopping cart. - nopCommerce/NopStartup.cs at 72657ad4d09f2c1a413dac5c4e780473ac5990ca · nopSolutions/nopCommerce

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ ✅ Generic-ify adding scoped for entities